Denison ISD School Calendar 2025-2026
Denison ISD is a public school district in Texas serving 4,940 students. This page covers the 2025-2026 school year with day-level calendar data.
This district is part of the Sherman-Denison, TX metropolitan area.
4,940
Enrollment
165
School Days
40
Break Days
2025-2026
School Year
Calendar Summary
First Day of School
August 25, 2025
Last Day of School
May 22, 2026
NCES District ID
4816710
State
Texas
Breaks & Holidays
Scheduled breaks and holidays for Denison ISD during 2025-2026 (excludes weekends and summer):
| Break | Start | End | Days |
|---|---|---|---|
| New Teacher Inservice Start | Aug 11 | Aug 11 | 1 |
| New Teacher Inservice End | Aug 15 | Aug 15 | 1 |
| Teacher Inservice Start | Aug 19 | Aug 19 | 1 |
| Teacher Inservice End | Aug 21 | Aug 21 | 1 |
| No School Labor Day | Sep 1 | Sep 1 | 1 |
| No School Teacher Inservice | Sep 15 | Sep 15 | 1 |
| No School Teacher Inservice | Oct 20 | Oct 20 | 1 |
| End Of 1St Quarter | Oct 21 | Oct 21 | 1 |
| Start Of 2Nd Quarter | Oct 22 | Oct 22 | 1 |
| No School Conference Trade Day | Oct 31 | Oct 31 | 1 |
| No School Teacher Inservice | Nov 17 | Nov 17 | 1 |
| Thanksgiving Break | Nov 26 | Nov 28 | 3 |
| Winter Break | Dec 24 | Jan 1 | 9 |
| No School Teacher Inservice | Jan 2 | Jan 2 | 1 |
| Start Of Second Semester And Third Quarter | Jan 5 | Jan 5 | 1 |
| No School Teacher Inservice | Feb 2 | Feb 2 | 1 |
| No School Break | Feb 13 | Feb 16 | 2 |
| End Of 3Rd Quarter | Mar 13 | Mar 13 | 1 |
| No School Teacher Inservice | Mar 16 | Mar 16 | 1 |
| Start Of 4Th Quarter | Mar 17 | Mar 17 | 1 |
| No School Conference Trade Day | Apr 2 | Apr 2 | 1 |
| Spring Break | Apr 3 | Apr 6 | 4 |
| No School Teacher Inservice | Apr 20 | Apr 20 | 1 |
| Seniors Last Day | May 15 | May 15 | 1 |
| Graduation | May 17 | May 17 | 1 |
| No School Memorial Day | May 25 | May 25 | 1 |
School Year Calendar
Visual calendar for Denison ISD, July 2025 through June 2026:
Jul 2025
| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | |
| 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| 21 | 22 | 23 | 24 | 25 | 26 | 27 |
| 28 | 29 | 30 | 31 |
Aug 2025
| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||
| 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| 18 | 19 | 20 | 21 | 22 | 23 | 24 |
| 25 | 26 | 27 | 28 | 29 | 30 | 31 |
Sep 2025
| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| 22 | 23 | 24 | 25 | 26 | 27 | 28 |
| 29 | 30 |
Oct 2025
| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | ||
| 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| 20 | 21 | 22 | 23 | 24 | 25 | 26 |
| 27 | 28 | 29 | 30 | 31 |
Nov 2025
| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| 1 | 2 | |||||
| 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| 24 | 25 | 26 | 27 | 28 | 29 | 30 |
Dec 2025
| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| 22 | 23 | 24 | 25 | 26 | 27 | 28 |
| 29 | 30 | 31 |
Jan 2026
| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | |||
| 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 19 | 20 | 21 | 22 | 23 | 24 | 25 |
| 26 | 27 | 28 | 29 | 30 | 31 |
Feb 2026
| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| 1 | ||||||
| 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| 16 | 17 | 18 | 19 | 20 | 21 | 22 |
| 23 | 24 | 25 | 26 | 27 | 28 |
Mar 2026
| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| 1 | ||||||
| 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| 16 | 17 | 18 | 19 | 20 | 21 | 22 |
| 23 | 24 | 25 | 26 | 27 | 28 | 29 |
| 30 | 31 |
Apr 2026
| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | ||
| 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| 20 | 21 | 22 | 23 | 24 | 25 | 26 |
| 27 | 28 | 29 | 30 |
May 2026
| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | ||||
| 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| 11 | 12 | 13 | 14 | 15 | 16 | 17 |
| 18 | 19 | 20 | 21 | 22 | 23 | 24 |
| 25 | 26 | 27 | 28 | 29 | 30 | 31 |
Jun 2026
| M | T | W | T | F | S | S |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| 15 | 16 | 17 | 18 | 19 | 20 | 21 |
| 22 | 23 | 24 | 25 | 26 | 27 | 28 |
| 29 | 30 |
In SessionBreak/HolidayWeekend
Multi-Year Comparison
Calendar data across school years for Denison ISD:
| School Year | First Day | Last Day | School Days | Break Days |
|---|---|---|---|---|
| 2024-2025 | Aug 19 | May 22 | 177 | 31 |
| 2025-2026 | Aug 25 | May 22 | 165 | 40 |
| 2026-2027 | Aug 13 | May 21 | 202 | 0 |
Want This Data in Your Pipeline?
Get day-level calendar data for Denison ISD and 13,700+ districts via API. $99/mo for full access.
Get API Access →